Surname meaning for "Mullaney"

Irish (Connacht): Anglicized form of Gaelic

Ó Maoil
Sheanaigh ‘descendant of Maoilsheanaigh’, a personal name
meaning ‘devotee of (Saint) Seanach’, a personal name based on
sean ‘ancient’, ‘old’. Because most Connacht spellings omit the
Sh (pronounced as h), it has been suggested that the
original name might have been Ó Maoileanaigh ‘descendant of
Maoileanach’, a personal name meaning ‘chief of the marsh’.
There was a different Ulster family of this name, now extinct in
Ireland.
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